CVE-2025-20352
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2025-09-29. Federal due date: 2025-10-20.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Impact
Cisco IOS and IOS XE contains a stack-based buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) subsystem that could allow for denial of service or remote code execution. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Ios Xe Sd-Wan | Versions 16.9.1, 16.9.2, 16.9.3, 16.9.4, 16.10.1, 16.10.2 |
| Cisco | Ios Xe | Versions 3.5.0e, 3.5.0sq, 3.5.1e, 3.5.1sq, 3.5.2e, 3.5.2sq |
| Cisco | Ios | Versions 12.2\(33\)sxi, 12.2\(33\)sxi1, 12.2\(33\)sxi2, 12.2\(33\)sxi2a, 12.2\(33\)sxi3, 12.2\(33\)sxi4 |